share/kernelcompat.h

   1 #ifndef KERNELCOMPAT_H
   2 #define KERNELCOMPAT_H
   3
   4 #include "compiler.h"
   5
   6 #include <string.h>
   7
   8 #define container_of(ptr, type, member) ({                      \
   9         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \
  10         (type *)( (char *)__mptr - offsetof(type,member) );})
  11
  12 #define KERN_DEBUG ""
  13 #define KERN_NOTICE ""
  14 #define KERN_INFO ""
  15 #define KERN_ERR ""
  16 #define KERN_ALERT ""
  17
  18 /* ERROR OPS */
  19
  20 #define MAX_ERRNO       4095
  21
  22 #define IS_ERR_VALUE(x) unlikely((x) >= (unsigned long)-MAX_ERRNO)
  23
  24 static inline void *ERR_PTR(long error)
  25 {
  26         return (void *) error;
  27 }
  28
  29 static inline long PTR_ERR(const void *ptr)
  30 {
  31         return (long) ptr;
  32 }
  33
  34 static inline long IS_ERR(const void *ptr)
  35 {
  36         return IS_ERR_VALUE((unsigned long)ptr);
  37 }
  38
  39
  40 /* FIXED SIZE INTEGERS */
  41
  42 #include <stdint.h>
  43
  44 typedef uint8_t u8;
  45 typedef uint16_t u16;
  46 typedef uint32_t u32;
  47 typedef uint64_t u64;
  48
  49 #define min_t(type, x, y) ({                    \
  50         type __min1 = (x);                      \
  51         type __min2 = (y);                      \
  52         __min1 < __min2 ? __min1: __min2; })
  53
  54 #define max_t(type, x, y) ({                    \
  55         type __max1 = (x);                      \
  56         type __max2 = (y);                      \
  57         __max1 > __max2 ? __max1: __max2; })
  58
  59
  60 /* MUTEXES */
  61
  62 #include <pthread.h>
  63
  64 #define DEFINE_MUTEX(m) pthread_mutex_t (m) = PTHREAD_MUTEX_INITIALIZER;
  65
  66 #define mutex_lock(m) pthread_mutex_lock(m)
  67
  68 #define mutex_unlock(m) pthread_mutex_unlock(m)
  69
  70 /* MALLOCATION */
  71
  72 #include <stdlib.h>
  73
  74 #define kmalloc(s, t) malloc(s)
  75 #define kzalloc(s, t) malloc(s)
  76 #define kfree(p) free((void *)p)
  77 #define kstrdup(s, t) strdup(s)
  78
  79 /* PRINTK */
  80
  81 #include <stdio.h>
  82 #define printk(fmt, args...) printf(fmt, ## args)
  83
  84 /* MEMORY BARRIERS */
  85
  86 #define smp_rmb() do {} while(0)
  87 #define smp_wmb() do {} while(0)
  88 #define smp_mb() do {} while(0)
  89 #define smp_mb__after_atomic_inc() do {} while(0)
  90
  91 #define read_barrier_depends() do {} while(0)
  92 #define smp_read_barrier_depends() do {} while(0)
  93
  94 /* RCU */
  95
  96 #define rcu_assign_pointer(a, b) do {} while(0)
  97 #define call_rcu_sched(a,b) do {} while(0)
  98 #define rcu_barrier_sched() do {} while(0)
  99
 100 /* ATOMICITY */
 101
 102 #include <signal.h>
 103
 104 typedef struct { sig_atomic_t counter; } atomic_t;
 105
 106 static inline int atomic_dec_and_test(atomic_t *p)
 107 {
 108         (p->counter)--;
 109         return !p->counter;
 110 }
 111
 112 static inline void atomic_set(atomic_t *p, int v)
 113 {
 114         p->counter=v;
 115 }
 116
 117 static inline void atomic_inc(atomic_t *p)
 118 {
 119         p->counter++;
 120 }
 121
 122 static int atomic_read(atomic_t *p)
 123 {
 124         return p->counter;
 125 }
 126
 127 /* CACHE */
 128
 129 #define ____cacheline_aligned
 130
 131 /* MATH */
 132
 133 static inline unsigned int hweight32(unsigned int w)
 134 {
 135         unsigned int res = w - ((w >> 1) & 0x55555555);
 136         res = (res & 0x33333333) + ((res >> 2) & 0x33333333);
 137         res = (res + (res >> 4)) & 0x0F0F0F0F;
 138         res = res + (res >> 8);
 139         return (res + (res >> 16)) & 0x000000FF;
 140 }
 141
 142 static inline int fls(int x)
 143 {
 144         int r;
 145 //ust// #ifdef CONFIG_X86_CMOV
 146         asm("bsrl %1,%0\n\t"
 147             "cmovzl %2,%0"
 148             : "=&r" (r) : "rm" (x), "rm" (-1));
 149 //ust// #else
 150 //ust//         asm("bsrl %1,%0\n\t"
 151 //ust//             "jnz 1f\n\t"
 152 //ust//             "movl $-1,%0\n"
 153 //ust//             "1:" : "=r" (r) : "rm" (x));
 154 //ust// #endif
 155         return r + 1;
 156 }
 157
 158 static __inline__ int get_count_order(unsigned int count)
 159 {
 160         int order;
 161
 162         order = fls(count) - 1;
 163         if (count & (count - 1))
 164                 order++;
 165         return order;
 166 }
 167
 168
 169 /* ARRAYS */
 170
 171 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
 172
 173 /* TRACE CLOCK */
 174
 175 static inline u64 trace_clock_read64(void)
 176 {
 177         return 0LL;
 178 }
 179
 180 static inline unsigned int trace_clock_frequency(void)
 181 {
 182         return 0LL;
 183 }
 184
 185 static inline u32 trace_clock_freq_scale(void)
 186 {
 187         return 0;
 188 }
 189
 190 #endif /* KERNELCOMPAT_H */